View Javadoc

1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.myfaces.orchestra.viewController.jsf;
20  
21  import javax.faces.context.FacesContext;
22  import javax.faces.el.EvaluationException;
23  import javax.faces.el.VariableResolver;
24  
25  import org.apache.myfaces.orchestra.viewController.ViewControllerManager;
26  import org.apache.myfaces.orchestra.viewController.ViewControllerManagerFactory;
27  
28  /**
29   * Provides a way to access the viewController through the JSF expression language (EL)
30   * using the special variable name <code>oxViewController</code>.
31   */
32  public class ViewControllerVariableResolver extends VariableResolver
33  {
34      private final static String VIEW_CONTROLLER_VARIABLE = "oxViewController";
35  
36      private final VariableResolver original;
37  
38      public ViewControllerVariableResolver(VariableResolver original)
39      {
40          this.original = original;
41      }
42  
43      public Object resolveVariable(FacesContext facesContext, String variableName) throws EvaluationException
44      {
45          if (VIEW_CONTROLLER_VARIABLE.equals(variableName))
46          {
47              ViewControllerManager manager = ViewControllerManagerFactory.getInstance();
48              return manager.getViewController(facesContext.getViewRoot().getViewId());
49          }
50  
51          return original.resolveVariable(facesContext, variableName);
52      }
53  }